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Questions  

An infinite wire bent in the form of I carries current i. What is the magnetic field at the point O ?

a
zero
b
μ04π×ip
c
μ04π×i2p
d
μ0i(1+2)42πp

detailed solution

Correct option is D

B due to both parts is in the same direction and the two parts behave as semi infinite conductor .B = μ0 i4πp( sin 900+sin 450) =μ0i(1+2)42πp

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